Merge pull request #75 from aboe76/enable_values_absent

added test for value None, to be an absent value

nginx/ng/files/nginx.conf

 {% set indent_increment = 4 %}
 
 {%- macro nginx_block(value, key=None, operator=' ', delim=';', ind=0) -%}
+    {%- if value != None -%}
     {%- if value is number or value is string -%}
         {{ key|indent(ind, True) }}{{ operator }}{{ value }}{{ delim }}
     {%- elif value is mapping -%}
     {%- else -%}
         {{ key|indent(ind, True) }}{{ operator }}{{ value }}{{ delim }}
     {%- endif -%}
+    {%- else -%}
+    {%- endif -%}
 {%- endmacro -%}
 
 # Default nginx server configuration